What statistical software to learn?

There are a range of statistical software packages available, some costly, other free, and some in between. Which to choose? Which to invest time to learn (Blood sweat, tears and frustration) and money to buy? SPSS has it forte in that it has a pretty interface that...

How politicians poisoned statistics

In this article, Tim Harford uses the distinction put forth by the Princeton philosopher Harry Frankfurt, between those who lie with statistics, and those who simply do not care what the facts are, but use statistics to support their position. The latter can be...

Randomized control trial: The gold standard or overrated?

While randomized control trial (RCT) have long been seen as the epitome of evidence based research, having served to modernize the field of medicine, this article questions its use to test social policy. The argument is that where RCT’s come into their own when...

How well do you see a correlation?

We have all read correlation matrixes, and have seen: As a rule of thumb, the following guidelines on strength of relationship are often useful (though many experts would somewhat disagree on the choice of boundaries). Value of r Strength of relationship 1.0 to -0.5...